I actually learned about Frontier Airlines’ backpack policy the hard way last year when I flew from Denver to Orlando for a quick weekend trip. I thought I was being super efficient by packing everything into my small backpack, only to realize at the airport that Frontier has specific size rules for what counts as a personal item versus a carry-on. Luckily, my backpack just barely fit under the seat, so it was free — but I saw a few other passengers get charged because their bags were slightly too big.
After that experience, I called (877-764-3622) before my return flight to make sure I understood the baggage guidelines properly. The rep was really helpful and told me that as long as your backpack fits under the seat (usually around 14” x 18” x 8”), you can bring it for free. Anything larger counts as a carry-on, which costs extra depending on when and how you add it to your booking.
Now I always double-check the dimensions before flying Frontier and even use a small duffel when I need extra space. I also found out through that same call that you can add or modify baggage options at any time — and sometimes it’s cheaper to do it by phone than at the airport.
So yes, you can bring a backpack for free, but make sure it fits the size limits. And honestly, if you’re ever unsure, just call (877-764-3622) — they’ll walk you through it and even help you adjust your booking if needed. Saved me a ton of stress!
